Here's one..it's almost a perfect match with the one above...it uses only static light and tweaking of the ambient value of individual block faces:



Another factor that lightens it up is fog. The only thing that bugs me is the artifacting from both dynamic lights and from fog. I really hate it.

Here are two shots of my new dust...the first is simply the "patches" in place in front of each window...the 2nd is a test light shaft...it looks great in motion...that hard edge around the flare is not noticeable in motion: